[Linux-cluster] XVM Fence Daemon

[jim parsons]

> 04:57:15 pm Chris Edwards wrote:
> > In Luci it gives me an option to run a XVM fence daemon, does anyone 
> > know what this is?
> >
> > Thanks!
> >
> > ---
> >
> > Chris Edwards
When building a cluster of virtual machines (an inner cluster, if you
will), it is necessary to have a way of fencing a virtual node. This is
where fence_xvm comes in handy. It consists of two parts: The agent
itself which resides in the /sbin dir of each virtual node, and a
fence_xvm daemon (fence_xvmd) which runs on the hardware supporting the
virtual nodes (the outer cluster). The daemon listens for fencing
requests from the agents on the virtual nodes, and then does the deed:
quickly, and without remorse. ;)

Selecting the luci option to run XVM fence daemon places a configuration
setting in the outer clusters' cluster.conf file indicating this daemon
needs to be started when the outer cluster starts. You will still need
to configure the virtual nodes to use fence_xvm though. 

-j
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